Thermo-hydro-mechanical modeling with Langmuir's adsorption isotherm of the CO2 injection in coal

Abstract : In this paper, we used a theoretical model for the variation of Eulerian porosity, which takes into account the adsorption process known to be the main mechanism of production or sequestration of gas in many reservoir of coal. This process is classically modeled using Langmuir's isotherm. After implementation in Code_Aster, a fully coupled thermo-hydro-mechanical analysis code for structures calculations, we used numerical simulations to investigate the influence of coal's hydro-mechanical properties (Biot's coefficient, bulk modulus), Langmuir's adsorption parameters, and the initial liquid pressure in rock mass during CO2 injection in coal. These simulations showed that the increase in the values of Langmuir's parameters and Biot's coefficient promotes a reduction in porosity because of the adsorption process when the gas pressure increases. Low values of bulk modulus increase the positive effect (i.e., increase) of hydro-mechanical coupling on the porosity evolution. The presence of high initial liquid pressure in the rock mass prevents the progression of injected gas pressure when CO2 dissolution in water is taken into account.
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International Journal for Numerical and Analytical Methods in Geomechanics, Wiley, 2015, 39 (6), pp.594-617. 〈10.1002/nag.2328〉
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https://hal.univ-lorraine.fr/hal-01284129
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Soumis le : lundi 7 mars 2016 - 13:24:27
Dernière modification le : mardi 29 mai 2018 - 12:51:03

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Kanssoune Saliya, Dragan Grgic, Richard Giot, Albert Giraud. Thermo-hydro-mechanical modeling with Langmuir's adsorption isotherm of the CO2 injection in coal. International Journal for Numerical and Analytical Methods in Geomechanics, Wiley, 2015, 39 (6), pp.594-617. 〈10.1002/nag.2328〉. 〈hal-01284129〉

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